Safety-knife.



No.- 712,792 Patented Nov. 4, |902.

l vW. C. HEIMERDINGER. l

SAFETY KNIFE.

(Application hled Feb. 24, 19024] (N0 Model.)

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VILLIAM C. HEIMERDINGER, OF LOUISVILLE, KENTUCKY.

SAFETY-rauwe.-

SEPECIFIGATION forming part of Letters Patent No. 712,792, datedNovember 4, 1902.

Application filed February 24,1902. Serial No. 95,305.. (No modela) I Toall whom t may concern:

Be it known that 1, WILLIAM C. HEIMER- DINGER, of Louisville, in thecounty of Jefferson and State of Kentucky, have invented certain new anduseful Improvements in Safety-Knives; and I do hereby declare thefollowing to be a full, clear, and exact description of the invention,such as will enable others skilled in the art to which it appertains tomake and use the same.

My invention relates to an improvement in safety-knives designedparticularly for cutting and trimming corns or other callous portions ofthe epidermis, the object being to piovide a knife with a blade havingoppo= sitely-disposed cutting edges, so located with relation to thehandle that it'will operate with both a draw and a push cut, thuspermittingA it to be used in places Where a single cutter could not beconveniently used.

With this end in view my invention consists in the details ofconstruction, as will beV more fully described, and pointed out in theclaims.

In the accompanying drawings, Figure l is a view in perspective of myimproved knife. Fig. 2 is a View in longitudinal section of same. Fig. 3is a View in transverse section through the blade-holding screw, andFig. t

is a view of the blade and-handle detached.

l represents a handle of any convenient shape and size, providedwith abent orcurved neck 2, carrying the elongated head 3, the latter beingapproximately fiat on its upper face and slightly convexed on its lowerface. This head 3 is provided with a central elongated opening 4, lthelatter being restricted or narrowed near the center of the head, so thatthe side walls thereof will form a seat for the blade-holding screw 5,thus providing enlarged openings adjacent to each cutting edge of theblade through which the flakes of skin removed by the cutting edgesreadily escape, thus preventing the possibility of clogging the parts.The blade 6 is beveled on its under side from its center toward bothends and is of a length about equal to the length of the opening in thehead. The blade 6 rests on a flat seat formed on the under con- Vex sideof the head and is held against lateral displacement by the ribs 7 atopposite sides of said seat, and as the upper face of the blade is fiatand the lower face of the head slightly convex the ends of the bladeproject sufficiently to shave off the tine iakes of the hard skin.

. With a blade held at an angle to the surface being operated upon thereis a tendency for the blade to scrape or pull instead of making a cleancut. With my improvement the blade rests approximately parallel with thesurface operated upon, which insures a free and clean cut. Again, bothends of the blade are guarded or sheathed, and the clearance or openingat the back of each end is sufliciently large for the free escape of allthe flakes of skin removed, thus preventing the possibility of the partschoking, and with a blade constructed to cut With either a pull or lpushmovement one is enabled to operate on corns which would be inaccessibleto a knife having only one of these movements, It is also apparent thatwith a bladelocated approximately parallel with the surface beingoperated upon it will not cut or flake soft healthy tissue, but where ahardened skin offers resistance it simply shaves the same off in fineiakes.

It is evident that changes in the construc- Ation and relativearrangements of the parts might be made without avoiding my invention,and hence I wouldk have it understood that I do not restrict myself tothe particular construction and arrangement of parts shown anddescribed; but, I

Having fully described my invention, what I claim as new, and desire tosecure by Letters Patent, is-

l. A safety-knife comprising a handle having a head the latter beingprovided with an opening and a blade secured over said opening andhaving a cutting edge at each end.

2. The combination with a handle having a head, the latter beingprovided on its lower face with curved or convex ends, and an openingthrough said head between said ends, of a double-edge blade securedagainst the lower face of the head, its two cutting ends overlapping theconvex ends of the-head.

3. The combination with a handle having a head the latter being providedon its lower face with a flat seat, ribs on opposite sides of IOO saidseat, curved or convex ends andan open- I blade the lower face of whichis beveled, and to ing through the head adjacent to each end, of l ascrew for locking the blade in place. a double-edged blade resting onsaid seat and In testimony whereof I have signed this a screw securingthe latter in place. specification in the presence of bwo subscrib- 5 4.The combination with the handle and ing Witnesses.

head, the lower face of the latter having a VILLIAM C. HEIMERDINGER.

flat seat, eurved or convex ends, openings lVitnesses:

ED. STOLL.

through same adjacent to the ends, and ribs A. C. W. PELLE, on oppositesides of the seat, of adouble-edge l

